Attachment plug



March 25 1924. 1,487,699

A. W, ALBRECHT ATTACHMENT PLUG Filed March 25, 1990 vide an attachment plug Patented Mar. z5, 1924.

UNITED STATES ALBERT W. ALBBECHT, 0F ST. LGUIS, MISSOURI.

ATTACHMENT PLUG.

i Application led Harch 25, 1920. Serial No. 368,536.

To all whom it may concern.'

Be it known that I, ALBERT W. ALBRECHT, a citizen of the United States, residing at the city of St. Louis and State of Missouri, have invented a new and useful Attachment Plug, of which the following is ra specification.

This invention relates to improvements in attachment pings, and consists in the novel construction hereinafter disclosed.

An object of the invention is to provide a separable or pull-apart attachment plug for extension cords which vhas swivel ymovement and is also equipped with an individual blow out fuse.

Another object of the invention is to prowhich may be economically constructed and which will beef ficient in use.

Further objects of the invention will be ap arent from the following detailed description thereof taken in connection with the accompanying drawing, in which- Fig. 1 l1s a vertical section through the construction. I.

Fig. 2 is a bottom 1plan. view of the base phg, witha removab e plug body removed. 1 3 is a top plan view of the removable phgiody.,

ig.' 4 is a bottonlpan view of the ate tachment plug assem In the embodiment of the invention illusthe base plug 1 is 'in trated in the drawing the form of a substantially circular body of insulating material, having a central open-r ing 2 threaded to receive a screw bushing 3 through which the end of the extension cord 4 passes, the cord bei formed of two wires 5 and 6 with the usua' The under face of the base plug 1 has a circular recess 7 formed thereln, within which is a substantially circular rib 8 having an extension 9 that forms a seat for the end of a contact leaf 10, the leaf 1() being attached to the lug by a screw 11 passing through the leal) near its outer end. Theleaf 10 is deflected sli htly downwardly, and has a threaded ho e near its inner end to receive a binding screw l12 whereby the end of the wire 6 is attached to the leaf 10.k

The base plu carries a split metallic contact sleeve 13 t at has inturned ears 14 at its upper edge. The sleeve 13 is held in connection with the base plug body by screws 15 that pass through openings in the ears 14.- and screwed into threadedr openings insulating covering.y

vThe threaded wall the section 30, t

in the plug body. The end of the wire 5 is connected with the sleeve by binding it into contact with one of the ears 14 by one of the screws 15. The sleeve 13 is formed with a bead 16 adjacent to its lower end which bead constitutes a lock connection with the outer contact sleeve as will be described hereinafter.

A detachable plug body 17 is substantially cylindrical in form and has formed in the upper part thereof an annular recess 18 that em races the upper part. of the inner contact sleeve 13. The lower part of the body 17 has a recess 19 of a diameter somewhat greater than the recess 18. A central core 21 at its outer end has radial spaced webs 20 bearing against the inner wall of the body 17 and supporting the core in the body.

The core -21 has a substantially oblong opening 22 in the center thereof. At each end of the opening 22 are spring sockets 23 held in place in the openings by screw connections 21. 'llhev sockets 23 are adapted to receive and support ablow-out fuse 25 having enlarged hea s 26 that seat in the sockets 23. In mounting the fuse 25 it is -slipped endwise throughl one of the sockets 23 and is held bythe sprin contact in adjustment by the sockets 23. e upper end of the fuse 25 makes contact 'with the contact leaf 16,

' and the lower end of the fuse is arranged contact with the screw socket of the exten sion cord leading to the electrical ap aratus or device with which the supply lea 1 may be connected.

The inner split contact member 27 has al` channel 28 near its upper end that engages with the bead 16 holding said two parts in electrical contact. The lower endl of the member 27 has openings through which webs 20 extend to en agement with the body 17. The parts of t e member 27 between the webs 26 are'integral with the flange 29 that connects with a threaded wall 30 embracing the lower end of the body 17. 30 constitutes a screwconnection for the socket of the extension cord of the electrical a yparatus or device designed to be connecte into the circuit.

Since the socket that is adapted to be attached to the plug is of the usual construction it has not been shown, it being understood that it ma be screwed in place over e central contact portion of the socket making contact'with the outer ends of the fuse 25.

icc'

It will be observed, since the two menbers 13 and 27 are connected and since the threaded wall 30 forms an extension of the member -27, that the electrical circuit will pass through the members 13 and 27 to the wall 30 that is in contact with the screw portion of the attaching socket, the central portion of the socket being in contact with the outer end of the fuse 25, the circuit is completed through the fuse to the wire 6 that is in. electrical connection with the contact leaf l0. It will be observed that the plug socket of this construction may be readily connected and disconnected b separating the two plug elements. It wi l also be observed that` the blow out fuse may be readily replaced and that by providing the blow out fuse for each individual socket the main line fuses are protected.

It will further be observed since the two contact sleeves have a swivel connection with one member of the attachment plug,

one may revolve with respect to the other so as to avoid twisting of the extension cords. Thus the construction full accomplishes the purposeand objects ereinbefore set out.

am aware that the invention may be modied in certain particulars without departing from the spirit and scope of the invention, and I do not limit myself therefore to the exact construction shown and described, but what I claim and desire to secure by Letters Patent, is zl. An attachment plug, comprising an insulating base body, a terminal contact plate carried by said body, a contact sleeve carried by said bod out of circuit with said plate, a detachab e bod rtion, a Contact member carried by said7 diitachable portion and having an exteriorly threaded socket member connected therewith, a support in said detachable body portion open at its outer end, and a fuse plug carried in said spport having its inner end contacting with said terminal contact plate, and having its outer endv projecting through the open outer end of said support and arranged to contact with an outside circuit member.

2. An attachment plug, comprising a base body, a terminal plate carried by said base body and connecting with one lead of an extension circuit, a split contact sleeve supported by said base section and connected with' the other lead of said extension' circuit, a detachable body, a contact member in said detachable body arranged for swivel frictional contact with said contact sleeve, an extension of said contact member carried by the outer wall of Said secondnamed body and arranged to receive a Socket member, and a fuse supported b said second-named body contacting with said contact plate at one opposite end extending beyond the detachable body and arranged for contact with a socket to which said extension may be connected.

3. An attachment body, a split sleeve dy having electricaliconnection with one lead of an extension circuit, a contact plate carried by said base body and connected with the other lead of said extension circuit, a detachable bod a contact member in said detachable bo y arranged for engagement with said sleeve, a socket connecting member in connection with said contact member, a support in said detachable body, fuse sockets in said support, and a removable fuse plug carried by said fuse sockets having its outer end beyond said detachable body and arranged to complete the electrical circuit from said contact plate to a Contact member of a socket arranged for connection with said extension.

ALBERT W. ALBRECHT` end and having its plug, comprising a base supported by said base 

